Balanced valve



(No Model.)

M. J. MGGINN..

4 BALANGED VALVE. No. 807,485. Patented Nov. 4, 1884.

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MICHAEL J. MOGINN, OF SPRINGFIELD, OHIO BALANCED VALVE. I

SPECIFICATION forming part of Letters Patent No. 307,485, dated November4, 1884.

Application filed February 11, 1884. (No model.)

To @ZZ whom, it may concern:

Be it known that I, MICHAEL .T. MeGINN, of the city ot' Springfield,county ot'Clarl,aiid State of Ohio, have invented certain new and usefulImprovements in Balance-Valves for Steam-Chests, ot' which the followingis a specification.

This invention relates to improvements in balance-valves forsteam-chests ot engines.

Heretofore in engines of ordinary construction where common slide-valvesare used much annoyance has been caused by the pressure of steam againstthe upper face of the valve, which caused great fricion between thelowerface and seat of the valve and necessitated an increased power tooperate it.

rIhe object of this invention is to provide a cheap and eiectivebalance-plate to obviate the pressure of steam against the upper face ofthe valve. V

The invention consists in the combination, with a valve, of abalance-plate located at a point above the said valve and provided withadjusting mechanism, whereby the said balance-plate may be raised orlowered with relation to the valve from the outside of thesteam-chamber.

Figure l is a vertical section of the pistonchamber and steamchest ofordinary construction, showing my invention as applied thereto. Fig. 2is a detail view, partially in section, line of section x r, Fig. 1, ofa balance-plate constructed in accordance with my invention, shown asprovided with three adjusting-screws.

The piston chamber A, piston B, steamchest C, and slide-valve D are andmay be of any ordinary construction, having the usual steam pipe,-a,inlet ports b b', and exhaustport c. The balance-plate E, of suitablesize and shape, having its lower face planed smooth, so as to contactwith the planed upper face ofthe valve D, is preferably provided withone or more ball-soclcets,F,which receive and hold the balls G ofadjusting-screws H,whieh extend through the upper portion of thesteamchest O. At the upper end of the adjustingscrews H are hand-wheels,by which the said screws are turned. The upper face of the balance-plateE, at the points where the ball-andsocket connections are made, ispreferably recessed sufficiently therein, thereby lessening the amountof space which they would otherwise take up;

The object of providing a ball-andsocket connection betweenadjusting-screws H'and balance-plate Eis to allow a lateral play of toallow the balls G to rest the adjusting-screws H, in case ot" anyvariation froma smooth horizontal plane in the surface of the valve D,which is liable to occur from expansion or contraction.

It is desirable that the balance-plateEshall at all times Contactclosely with the valve D without binding7 so as to cause undue friction.To accomplish this, it is necessary to provide a means of adjustment,and, as it is desirable to alter the adjustment of said balance-plate Ewith relation to the valve D at times during the operation ot' theengine, I have provided for said adustment from the outside of thesteam-chest, which is greatly advantageous.

I claimh l. In a steam-chest, the combination, with the balance-plate E,of sockets connected therewith, and adjusting-screws provided with aball at one end to be engaged and held by the said sockets, all' as andfor the purpose set forth.

2. The combination,in asteam-chest,with the balance-plate E, and socketsF, attached thereto, of adjustingscrews provided with a ball at one endand a hand-wheel at the opposite end, and adapted to be adjusted fromthe outside ot' the steam-chest, substantially as described.

In witness whereof I have hereunto set my hand and seal, at Springiield,Ohio, this 5th day of February, A. D. 1884.

MICHAEL J. MCGINN. [L s] In presence of- (EI-ms. STEWART, N. E. C.WHITNEY.

